by Quade » Sun May 05, 2013 4:48 pm
What version are you using?
In the latest, it removes the pars when all the files that make up the set are confirmed and repaired. If you never download all the files, it won't remove the pars because it's waiting for more files. Older versions might not have cleaned up as well. You can see the par counts. They should tell you how much of the set has downloaded.